Without an equality sign the expression given has no solutions
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If you mean: 4x+3y = -1 and x-3y = -34 then x = -7 and y = 9
y = 4x is a formula or open statement. It can be used to define the function, f = [(x,y) : y = 4x} , commonly denoted by f(x) = 4x.
y = 2x-5 4x-y = 7 => y = 4x-7 2x-5 = 4x-7 2x-4x = 5-7 -2x = -2 x = 1 Therefore by substituting: x = 1 and y = -3
X=(-2) y=(4)
8x + 2y = -10 As all terms have a factor of 2 then the values can be reduced accordingly. 4x + y = -5 If required, the equation can be re-written to show x or y as the subject. 4x + y = -5 : 4x = -y - 5 : x = (-y -5)/4........this can also be written as x = (y + 5)/-4 4x + y = -5 : y = -4x - 5